Abstract: A portable barrier (11) comprising a base portion (13) and a barrier portion (15). The base portion (13) is adapted to rest on the ground and the barrier portion (15) is moveable relative to the base portion between a collapsed condition in which it locates against the base portion for compactness and an erected condition in which it extends upwardly from the base portion to perform a barrier function. A connection means (100) is provided for connecting adjacent barriers (11) together to form a barrier assembly (10). The connection means (100) is in the form of a pin connection system comprising spigots (101) on one side of the barrier (11) and corresponding sockets (103) on the other side of the barrier, the arrangement being that the spigots (101) of one barrier engage in the corresponding sockets (103) of an adjacent barrier thereby to provide a connection between the two barriers.